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2019 NABTEB BIOLOGY OBJ & THEORY VERIFIED ANSWERS
_*2019 NABTEB GCE NOV/DEC BIOLOGY OBJ & THEORY SOLUTION*_
Biology – Obj
1-10: BACBAACBCA
11-20: DBDBDADDDB
21-30: CCBCBBCADD
31-40: BBCBCDBABA
41-50: BAABBAACDC
(1a)
(i) Nucleus
(ii) Cytoplasm
(1b)
(i) A sexual reproduction e.g. Binary fission
(ii) Sexual reproduction e.g. Viviparous
(1c)
(i) Prophase: The prophase is divided into two, Early and late prophase. During early prophase, the chromosomes become visible as they contract and nucleolus shrinks. Centrioles are formed at opposite sides of the nucleus. Spindle fibres start to form and during the late prophase, the chromosomes become shorter and fatter. Each is seen to consist of a pair of chromatids joined at the centromere and nucleus disappear. Prophase ends with the breakdown of nuclear membrane
(ii) Metaphase: Metaphase also exists in early and late forms. During early metaphase, the chromosomes arrange themselves on the equator of the spindle and at late metaphase, the chromatids draw apart at the centromere region.
(iii) Telophase: Telophase stages is equally divided into early and late forms. During the early telophase, the cell starts to constrict across the middle. During the late telophase, the constriction continues. The nucleolus reform in each daughter cell. Spindle apparatus degenerates.
(2a)
• After pollination, the pollen grain absorbs a sugary liquid on the stigma, swells and germinates.
• The outer coat of the pollen grain, the ezine, splits. The pollen tube grows out and down inside the style.
• At the initial stage, the pollen grain has only one nucleus. Later, this nucleus divides into two. A larger tube nucleus and a smaller generative nucleus.
• The pollen tube grows into the ovule through the micropyle, and at the end of the pollen tube bursts. The two male nuclei are released into the embryo sec.
• One male nuclei fuses with the ovum to form a zygote.
(2bi)
(i) Stems
(ii) Leaves
(iii) Roots
(2bii)
Tropic movement is a type of response in which a part of a plant moves in response to a directional stimulus.
(2c)
(i) Chemotropism is growth in response to chemicals.
(ii) Phototropism is growth in response to light.
(iii) Hydrotropism is growth in response to water.
(5ai)
(i) It gives support to the body.
(ii) It protects important and delicate organs of the body.
(iii) It provides places for the attachment of muscles.
(iv) It gives shape to the body
(v) It helps to store important mineral salts such as calcium.
(vi) It aids in respiration.
(5aii)
(i) Exo Skeleton
(ii) Endo Skeleton
(iii) Hydrostatic Skeleton
(5bi)
An enzyme is an organic catalyst, usually portentous in nature, which promotes or speeds up chemical changes in living cells but are not themselves used up in the process.
(5bii)
(i) All enzymes are protein in nature.
(ii) Enzymes are usually involved in reversible reactions.
(iii) Each enzyme is specific in action. i.e. An enzyme of a group of enzymes deals with only one process.
(iv) Enzymes accelerate the rate of chemical reaction.
(v) Enzymes like any other catalyst act in very small quantities and catalyse large amount of substrate.
(5c)
The digestion of fats and oil in the duodenum is aided by a green alkaline liquid called bile which is secreted by the liver and stored in the gall bladder. The bile helps in the emulsification of fats, i.e. breaking down fats into tiny droplets. At the end of digestion in the duodenum the food now in liquid form called chyle passes to the ileum or small intestine.
(6ai)
Pollution is the release of toxic or harmful substances into the environment by their natural forces or man and other animals to an extent that causes biological damage to man and his resources.
(6aii)
*Water Pollutionn*
Control: Dumping of refuse or petrochemical by-product into rivers, seas or streams should be avoided.
(6bi)
(i) It leads to pollution.
(ii) It produces unpleasant odour.
(iii) It occupies land space.
(iv) It can cause respiratory disorder.
(v) It destroys plants and animals.
(6bii)
Provision of waste bin carriage where refuse will be disposed, after which it will be taken away after a specific period of time.
(6ci)
Conservation is the planned or controlled exploitation or judicious use of natural resources to ensure their continuous availability and to preserve the quality or original nature of the environment.
(6cii)
Establishment of Zoo: That is the keeping of wildlife or wild animals in a cage in a zoological garden.
Posted by admin on 26th November 2019.
Tags: 2019 NABTEB BIOLOGY VERIFIED, 2019 NABTEB BIOLOGY VERIFIED ANSWERS, NABTEB BIOLOGY VERIFIED ANSWERS
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